Problem Description:
All Switch ports begin to make flashing lights.
To solve the problem we just have to disconnect and reconnect it.
(I attach a screenshot of the network traffic until time of the crash.)

Anyone have an idea of ​​the cause of these chrash?
May you recommend a reference of an good Switch that fits my needs? (to replace this one)

BTW: If you're really going to run 100 VM's on three hosts, you should really consider building a redundant network architecture so that, when one segment of the network "crashes", the hosts can use the second segment. FWIW: ProCurve switches are inexpensive and readily available (e.g., eBay).